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passt/log.h

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passt: Relicense to GPL 2.0, or any later version In practical terms, passt doesn't benefit from the additional protection offered by the AGPL over the GPL, because it's not suitable to be executed over a computer network. Further, restricting the distribution under the version 3 of the GPL wouldn't provide any practical advantage either, as long as the passt codebase is concerned, and might cause unnecessary compatibility dilemmas. Change licensing terms to the GNU General Public License Version 2, or any later version, with written permission from all current and past contributors, namely: myself, David Gibson, Laine Stump, Andrea Bolognani, Paul Holzinger, Richard W.M. Jones, Chris Kuhn, Florian Weimer, Giuseppe Scrivano, Stefan Hajnoczi, and Vasiliy Ulyanov. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-04-05 18:11:44 +00:00
/* SPDX-License-Identifier: GPL-2.0-or-later
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
* Copyright (c) 2022 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#ifndef LOG_H
#define LOG_H
conf, log: Instead of abusing log levels, add log_conf_parsed flag We currently use a LOG_EMERG log mask to represent the fact that we don't know yet what the mask resulting from configuration should be, before the command line is parsed. However, we have the necessity of representing another phase as well, that is, configuration is parsed but we didn't daemonise yet, or we're not ready for operation yet. The next patch will add that notion explicitly. Mapping these cases to further log levels isn't really practical. Introduce boolean log flags to represent them, instead of abusing log priorities. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-06-14 17:00:27 +00:00
#include <stdbool.h>
log: Don't define logging function 4 times In log.c we use a macro to define logging functions for each of 4 priority levels. The only difference between these is the priority we pass to vsyslog() and similar functions. Because it's done as a macro, however, the entire functions code is included in the binary 4 times. Rearrange this to take the priority level as a parameter to a regular function, then just use macros to define trivial wrappers which pass the priority level. This saves about 600 bytes of text in the executable (x86, non-AVX2). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-10-13 04:50:28 +00:00
#include <syslog.h>
log, conf: Add support for logging to file In some environments, such as KubeVirt pods, we might not have a system logger available. We could choose to run in foreground, but this takes away the convenient synchronisation mechanism derived from forking to background when interfaces are ready. Add optional logging to file with -l/--log-file and --log-size. Unfortunately, this means we need to duplicate features that are more appropriately implemented by a system logger, such as rotation. Keep that reasonably simple, by using fallocate() with range collapsing where supported (Linux kernel >= 3.15, extent-based ext4 and XFS) and falling back to an unsophisticated block-by-block moving of entries toward the beginning of the file once we reach the (mandatory) size limit. While at it, clarify the role of LOG_EMERG in passt.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-10-06 12:51:04 +00:00
#define LOGFILE_SIZE_DEFAULT (1024 * 1024UL)
#define LOGFILE_CUT_RATIO 30 /* When full, cut ~30% size */
#define LOGFILE_SIZE_MIN (5UL * MAX(BUFSIZ, PAGE_SIZE))
log: Don't prefix message with timestamp on --debug if it's a continuation If we prefix the second part of messages printed through logmsg_perror() by the timestamp, on debug, we'll have two timestamps and a weird separator in the result, such as this beauty: 0.0013: Failed to clone process with detached namespaces0.0013: : Operation not permitted Add a parameter to logmsg() and vlogmsg() which indicates a message continuation. If that's set, don't print the timestamp in vlogmsg(). Link: https://github.com/moby/moby/issues/48257#issuecomment-2282875092 Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-08-12 08:20:34 +00:00
void vlogmsg(bool newline, bool cont, int pri, const char *format, va_list ap);
void logmsg(bool newline, bool cont, int pri, const char *format, ...)
__attribute__((format(printf, 4, 5)));
log: Add _perror() logging function variants In many places, we have direct perror() calls, which completely bypass logging functions and log files. They are definitely convenient: offer similar convenience with _perror() logging variants, so that we can drop those direct perror() calls. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-06-14 22:25:23 +00:00
void logmsg_perror(int pri, const char *format, ...)
__attribute__((format(printf, 2, 3)));
log: Don't prefix message with timestamp on --debug if it's a continuation If we prefix the second part of messages printed through logmsg_perror() by the timestamp, on debug, we'll have two timestamps and a weird separator in the result, such as this beauty: 0.0013: Failed to clone process with detached namespaces0.0013: : Operation not permitted Add a parameter to logmsg() and vlogmsg() which indicates a message continuation. If that's set, don't print the timestamp in vlogmsg(). Link: https://github.com/moby/moby/issues/48257#issuecomment-2282875092 Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-08-12 08:20:34 +00:00
#define err(...) logmsg(true, false, LOG_ERR, __VA_ARGS__)
#define warn(...) logmsg(true, false, LOG_WARNING, __VA_ARGS__)
#define info(...) logmsg(true, false, LOG_INFO, __VA_ARGS__)
#define debug(...) logmsg(true, false, LOG_DEBUG, __VA_ARGS__)
log: Don't define logging function 4 times In log.c we use a macro to define logging functions for each of 4 priority levels. The only difference between these is the priority we pass to vsyslog() and similar functions. Because it's done as a macro, however, the entire functions code is included in the binary 4 times. Rearrange this to take the priority level as a parameter to a regular function, then just use macros to define trivial wrappers which pass the priority level. This saves about 600 bytes of text in the executable (x86, non-AVX2). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-10-13 04:50:28 +00:00
log: Don't prefix message with timestamp on --debug if it's a continuation If we prefix the second part of messages printed through logmsg_perror() by the timestamp, on debug, we'll have two timestamps and a weird separator in the result, such as this beauty: 0.0013: Failed to clone process with detached namespaces0.0013: : Operation not permitted Add a parameter to logmsg() and vlogmsg() which indicates a message continuation. If that's set, don't print the timestamp in vlogmsg(). Link: https://github.com/moby/moby/issues/48257#issuecomment-2282875092 Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-08-12 08:20:34 +00:00
#define err_perror(...) logmsg_perror( LOG_ERR, __VA_ARGS__)
#define warn_perror(...) logmsg_perror( LOG_WARNING, __VA_ARGS__)
#define info_perror(...) logmsg_perror( LOG_INFO, __VA_ARGS__)
#define debug_perror(...) logmsg_perror( LOG_DEBUG, __VA_ARGS__)
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
log, conf, tap: Define die() as err() plus exit(), drop cppcheck workarounds If we define die() as a variadic macro, passing __VA_ARGS__ to err(), and calling exit() outside err() itself, we can drop the workarounds introduced in commit 36f0199f6ef4 ("conf, tap: Silence two false positive invalidFunctionArg from cppcheck"). Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2023-02-27 03:06:19 +00:00
#define die(...) \
do { \
err(__VA_ARGS__); \
exit(EXIT_FAILURE); \
} while (0)
log: Add _perror() logging function variants In many places, we have direct perror() calls, which completely bypass logging functions and log files. They are definitely convenient: offer similar convenience with _perror() logging variants, so that we can drop those direct perror() calls. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-06-14 22:25:23 +00:00
#define die_perror(...) \
do { \
err_perror(__VA_ARGS__); \
exit(EXIT_FAILURE); \
} while (0)
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
extern int log_trace;
conf, log: Instead of abusing log levels, add log_conf_parsed flag We currently use a LOG_EMERG log mask to represent the fact that we don't know yet what the mask resulting from configuration should be, before the command line is parsed. However, we have the necessity of representing another phase as well, that is, configuration is parsed but we didn't daemonise yet, or we're not ready for operation yet. The next patch will add that notion explicitly. Mapping these cases to further log levels isn't really practical. Introduce boolean log flags to represent them, instead of abusing log priorities. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-06-14 17:00:27 +00:00
extern bool log_conf_parsed;
log, passt: Keep printing to stderr when passt is running in foreground There are two cases where we want to stop printing to stderr: if it's closed, and if pasta spawned a shell (and --debug wasn't given). But if passt is running in foreground, we currently stop to report any message, even error messages, once we're ready, as reported by Laurent, because we set the log_runtime flag, which we use to indicate we're ready, regardless of whether we're running in foreground or not. Turn that flag (back) to log_stderr, and set it only when we really want to stop printing to stderr. Reported-by: Laurent Vivier <lvivier@redhat.com> Fixes: afd9cdc9bb48 ("log, passt: Always print to stderr before initialisation is complete") Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2024-08-06 12:07:37 +00:00
extern bool log_stderr;
log: Initialise timestamp for relative log time also if we use a log file ...not just for debug messages. Otherwise, timestamps in the log file are consistent but the starting point is not zero. Do this right away as we enter main(), so that the resulting timestamps are as closely as possible relative to when we start. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-07-24 15:39:55 +00:00
extern struct timespec log_start;
conf, log: Instead of abusing log levels, add log_conf_parsed flag We currently use a LOG_EMERG log mask to represent the fact that we don't know yet what the mask resulting from configuration should be, before the command line is parsed. However, we have the necessity of representing another phase as well, that is, configuration is parsed but we didn't daemonise yet, or we're not ready for operation yet. The next patch will add that notion explicitly. Mapping these cases to further log levels isn't really practical. Introduce boolean log flags to represent them, instead of abusing log priorities. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-06-14 17:00:27 +00:00
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
void trace_init(int enable);
log.h: Avoid unnecessary GNU extension for token pasting clang says: ./log.h:23:18: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments] We need token pasting here just because of the 'format' in trace(): drop it. Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-10-12 15:31:37 +00:00
#define trace(...) \
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
do { \
if (log_trace) \
log.h: Avoid unnecessary GNU extension for token pasting clang says: ./log.h:23:18: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments] We need token pasting here just because of the 'format' in trace(): drop it. Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-10-12 15:31:37 +00:00
debug(__VA_ARGS__); \
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
} while (0)
void __openlog(const char *ident, int option, int facility);
log, conf: Add support for logging to file In some environments, such as KubeVirt pods, we might not have a system logger available. We could choose to run in foreground, but this takes away the convenient synchronisation mechanism derived from forking to background when interfaces are ready. Add optional logging to file with -l/--log-file and --log-size. Unfortunately, this means we need to duplicate features that are more appropriately implemented by a system logger, such as rotation. Keep that reasonably simple, by using fallocate() with range collapsing where supported (Linux kernel >= 3.15, extent-based ext4 and XFS) and falling back to an unsophisticated block-by-block moving of entries toward the beginning of the file once we reach the (mandatory) size limit. While at it, clarify the role of LOG_EMERG in passt.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-10-06 12:51:04 +00:00
void logfile_init(const char *name, const char *path, size_t size);
log: Drop newlines in the middle of the perror()-like messages Calling vlogmsg() twice from logmsg_perror() results in this beauty: $ ./pasta -i foo Invalid interface name foo : No such device because the first part of the message, corresponding to the first call, doesn't end with a newline, and vlogmsg() adds it. Given that we can't easily append an argument (error description) to a variadic list, add a 'newline' parameter to all the functions that currently add a newline if missing, and disable that on the first call to vlogmsg() from logmsg_perror(). Not very pretty but I can't think of any solution that's less messy than this. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2024-07-24 14:36:17 +00:00
void passt_vsyslog(bool newline, int pri, const char *format, va_list ap);
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
void __setlogmask(int mask);
#endif /* LOG_H */
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